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PLoS One. 2008 Jul 2;3(7):e2567.

A common genomic framework for a diverse assembly of plasmids in the symbiotic nitrogen fixing bacteria.

Crossman LC, Castillo-Ramírez S, McAnnula C, Lozano L, Vernikos GS, Acosta JL, Ghazoui ZF, Hernández-González I, Meakin G, Walker AW, Hynes MF, Young JP, Downie JA, Romero D, Johnston AW, Dávila G, Parkhill J, González V.

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The Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom. lcc@sanger.ac.uk

Erratum in

PLoS ONE. 2008;3(8). doi: 10.1371/annotation/8d8e2649-c772-4363-b70b-b242c42f505f.
PLoS ONE. 2008;3(8). doi: 10.1371/annotation/4a58a9bd-7531-41d0-b101-53039a88c25b.

Abstract

This work centres on the genomic comparisons of two closely-related nitrogen-fixing symbiotic bacteria, Rhizobium leguminosarum biovar viciae 3841 and Rhizobium etli CFN42. These strains maintain a stable genomic core that is also common to other rhizobia species plus a very variable and significant accessory component. The chromosomes are highly syntenic, whereas plasmids are related by fewer syntenic blocks and have mosaic structures. The pairs of plasmids p42f-pRL12, p42e-pRL11 and p42b-pRL9 as well large parts of p42c with pRL10 are shown to be similar, whereas the symbiotic plasmids (p42d and pRL10) are structurally unrelated and seem to follow distinct evolutionary paths. Even though purifying selection is acting on the whole genome, the accessory component is evolving more rapidly. This component is constituted largely for proteins for transport of diverse metabolites and elements of external origin. The present analysis allows us to conclude that a heterogeneous and quickly diversifying group of plasmids co-exists in a common genomic framework.

PMID:: 18596979; [PubMed - indexed for MEDLINE]
PMCID:: PMC2434198

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